Valve for internal-combustion engines.



L'swEETzER.

VALVE FOR INTERNAL COMUSTION ENGINES- f APPLICATION yFILED )UL-Y 9,11915 1,249,689,

I Patented Dec.11r,1917.

` UNITED sTATEs PATENT; oEEIoE.

DANIEL-JAMES SWEETZER, 0F AUCKLAND, NEW ZEALAND.

VALVE FOR INT'ERNAL-UOMBUSTION ENGINES.

To aZZ 'whom it may concern.'

Be it known that I, .DANiEL JAMEs SWE J'rznn, a citizen of the Dominion of New Zealand, and residing at 16 Prospect Terrace, Mount Eden, Auckland, in the provincial district of Auckland, in the Dominion of New Zealand, have invented certain new and useful lumrovernents in Valves for Internal-Combustion Engines. of which the following is a specification.

This invention relates toan improved construction ot' cylindrical valve. for internal combustion engines whereby the efficiency of such valves is increased.

The details of the invention will be de scribed by the aid of the Iaccompanying drawings whereinz- Figure 1, is a longitudinal sectional eleva' tion, and

Fig. 2, an end elevation partly in section of an engine fitted with the valve.

Fig. 3, is a sectional elevation of the valve, Fig. 4, is an inverted View of the valve, Fig 5, an inverted perspective view of the packing piece,

Fig. 6, a plan of the cam. The working cylinder 1 is fitted with a piston 2 and has a combustion chamber 3 surmounted by a valve casing 4, a port 5 'forms a communication between the coinbustion chamber 3 and the Valve casing fl. The valve casing 4 is cylindrical and a valve 6 fits therein.

The ends 7 of the valve 6 are also cylindrical and have a working fit within the casing and in recesses formed in the covers 8 and 9 of the valve casing. Y

Cavitics or ports 10 and 11 are made in the valve 6 and have a length approximately corresponding with the port 5.

The inlet 12 is connected tothe carbureter or other means for supplying an explosive charge. The outlet 13 isconnected to the exhaust pipe.

The spindle 14 of the valve (S has an arm 15 the end of which is engaged by a groove 16 in a cam 17. y

The cam is driven by means of a shaft 18 from the main shaft 19 of the engine, any suitable skew bevel or `chain gear 2O being employed between theJ shafts.

The valve `6 is provided with a, deep groove 21 of rectangular configuration and of such size that it is adapted to completely surround the port `5. In Flg. 2, the port Specifieation of Letters Patent. l Patented Dec, 119 191 '1 I Application ined July 9, 1915.

Serial No. 38,906.

5 is indicated ,by dotted lines'and surrounded by the packing' groove 2l.

Within the groove 21 is 4fitted a reetangujerted radially from the valve. Leaf springs' 24 tend to project the packing piece 22 flpin the valve The packing piece 22 has an inward' pro )ection 25 which extends into or belowa concavity 2li formed in the valve between the sides of the 4groove 2l. lVhcn, therefore, thc explosive chai-gre is compressed and dnl'- ingl the power stroke pressure is exerted against the ravitv 'in the pressure is also excrteihon' the inward sides of the projection 25, thereby tori-innY the packing piece 22 tightly against the surface of the valve casingr l and assisting the springsl.

The packing piece is. therefore, adapted to prevent leakage from the port during compression and explosion strokes.

By providing the valve G with ports 10 and 1l, shaped as shown in the drawings, shutters 27 and 2S are formed, which overlap the ports l2 and 13 simultaneously with the closing oithe port 5 by the saidvalve 4. These shutters larilil'atc the lubrication and protect the walls of the valve chamber.

The possibility of communiration taking place at wrong periods between the port 5 and thc ports 12 and '1 25 is thus reduced to a minimum.

Thatl do claim and desire to secure by Letters Patent of the United States is 1. ln an internal combustion engine, a cylindrical valve chamber having a combustion port, a cylindrical valve adaptedV to bustion chamber, a cylindrical valve within said casing adapted Vat dilfcren't'points in its movement to place the inlet and exhaust ports in communication withthe combus tion chamber port and to close the latter, and a rectangular packing pecelocated in within saidcasing adapted atv dill'erent points in its movement to placethe inlet'and exhaust ports in communication' with the combustion chamber port and to close 4the latter, and a rectangular packing iece 1ocated in a rectangjl ar groove in t e valve and held by the presure of the com ressed gases against the ,wal of the valve `c amber during the compressions and exhaust strokes of the engine.

4. In an internal colnbustion-engine, a cylindrical valve chamber having inlet and exhaust ports, and a port leadlng to the combustion Jchamber, a cylindrical valve within said casing adapted at different oints in its -movementtn place the inlet and xhaust ports in communication with the combustion chamber 'port and to close the latter,' a rectangular packing piece located in a rectangular groove in the valve, springs normally pressing the packing piece out- IWardly, and means on said acking piece operated by the pressure of t e compressed gases for pressing the packing piece outwardly during the compression and eilplo-V sion, strokel,

5. In an internal r:ombusti'on engine, a cylindrical valve chamberA having inlet and eX- haust ports, and a port leading tothe combustion chamber, a cylindrical valve within saidl casing adapted at different points in its movement to place the inlet and exhaust ports in communication with the combustion chamber port and to close the latter, said valve having a part thereof` of ,less radius than the remainder of the valve and a rectangular groove surrounding said part, and a rectangular packingieee located in the Igroove in the valve an having an internal projection acted on by the compressed gases to press thepacking piece outwardly.

In testimony whereof I have signed my name to this specification inthe presence of two Witnesses;`

DANIEL JAMES SWEETZER.

Witnesses: l I v SIDNEY GIBSON CHAPMAN, ARTHUR Lswrr'r FERNEYHOUGH. 

